As I understand it, "Klingon" was a temporary name they came up with until somebody thought of something better - I guess nobody did 
If it's any help on the Jem'hadar front, a "Jemadar" was a Sepoy officer rank in the Indian Army in the early nineteenth century (I think it technically applied to native Madrasi troops). It was equivalent to a Lieutenant, and ranked immediately below "Subadar" (another possible alien race!).
I've heard the Indian derivation of Ferengi before and it makes perfect sense to me!
Jon
"There are worlds out there where the sky is burning, where the sea is asleep and the rivers dream; people made of smoke and cities made of song.
Somewhere there's danger, somewhere there's injustice, and somewhere else the tea is getting cold. Come on, Ace, we've got work to do."
THE DOCTOR, "Survival" (Doctor Who)